Does this item come with an amp cord?

No, but you can buy bundle of amp and cable.

What's the difference between these three amps of different colors?

The beige one is bass amp, the orange one is acoustic amp, and the black one is for electric guitar.

How to turn up the volume as much as possible?

When the gain is 0, the output power of the amplifier is only 1w, which sounds very small. To increase the volume, You can adjust the gain knob appropriately.

ASIN	B07RXYC3YM
Batteries	6 AA batteries required.
Best Sellers Rank	#2,484 in Musical Instruments ( See Top 100 in Musical Instruments ) #3 in Bass Guitar Amplifier Combo Amps
Color Name	beige
Compatible Devices	Double Bass
Connector Type	3.5mm Jack
Customer Reviews	4.2 4.2 out of 5 stars (2,476)
Date First Available	May 16, 2019
Item Weight	2.86 pounds
Item model number	Manufacturer-JOYO-MA10B-0012
Material Type	ABS Plastic
Musical Style	world-music
Output Wattage	10 Watts
Power Source	Corded Electric
Product Dimensions	9.45 x 5.91 x 6.69 inches

JOYO Portable 10W Mini Bass Amp Dual Channel Small Carry Bass Amplifier Combo for Guitar Bass Practice (MA-10B)

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